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MAX5937AB Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5937AB Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 23 page -48V Hot-Swap Controllers with VIN Step Immunity and No RSENSE _______________________________________________________________________________________ 7 Detailed Description The MAX5936/MAX5937 hot-swap controllers incorpo- rate overcurrent fault management and are intended for negative-supply-rail applications. The MAX5936/ MAX5937 eliminate the need for an external RSENSE and include VIN input-step protection and load probe, which prevents powering up into a shorted load. They are intended for negative 48V telecom power systems where low cost, flexibility, multifault management, and compact size are required. The MAX5936/MAX5937 are ideal for the widest range of systems from those requiring low current with small MOSFETs to high- current systems requiring large power MOSFETs and low on-resistance. The MAX5936/MAX5937 control an external n-channel power MOSFET placed in the negative supply path of an external load. When no power is applied, the GATE output of the MAX5936/MAX5937 clamps the VGS of the MOSFET to 2V, keeping the MOSFET turned off. When power is applied to the MAX5936/MAX5937, the 2V clamp at the GATE output is replaced by a strong pull- down device pulling GATE to VEE and the VGS of the MOSFET to 0V. As shown in Figure 2, this transition enables the MAX5936/MAX5937 to keep the power MOSFET continually off during the board insertion phase when the circuit board first makes contact with the backplane. Without this clamp, the GATE output of a powered-down controller would be floating and the MOSFET reverse transfer capacitance (gate-to-drain) would pull up and turn on the MOSFET gate when the MOSFET drain is rapidly pulled up by the VIN step dur- ing backplane contact. The MAX5936/MAX5937 GATE clamp can overcome the gate-to-drain capacitance of large power MOSFETs with added slew-rate control (CSLEW) capacitors while eliminating the need for addi- tional gate-to-source capacitance. The MAX5936/ MAX5937 will keep the MOSFET off indefinitely if the supply voltage is below the user-set UVLO threshold or if a short circuit is detected in the load connected to the drain of the power MOSFET. PIN MAX5936 MAX5937 NAME FUNCTION 11 GND Ground. The high-supply connection for a negative-rail hot-swap controller. 22 UVLO Undervoltage Lockout Input, On/Off Control. Referenced to VEE. Drive UVLO above the 1.25V rising threshold to turn on the device. To turn off the device, drive UVLO below the 1.125V falling threshold for the 1.5ms glitch rejection period. Leave UVLO disconnected for the default 31V undervoltage lockout threshold. Cycle UVLO to unlatch the MAX5936L/ MAX5937L after a fault. Cycling UVLO low deasserts PGOOD. 33 STEP_MON Input Voltage Step Monitor. 1.25V voltage threshold referenced to VEE. Connect a resistor between STEP_MON and VEE to set the step sensitivity. Connect a capacitor from GND to STEP_MON to adjust the step response relative to a step increase at VEE to eliminate false circuit-breaker and short-circuit faults. Connect to VEE to disable the step immunity function (see the Selecting Resistor and Capacitor Values for Step Monitor section in the Applications Information). 44 VEE Negative Input Voltage 55 LP Load-Probe Detect. Connect a resistor from LP to VOUT to set the load-probe test current. Limit load-probe test current to 1A. Connect to VEE to disable the load-probe function. 66 GATE Gate-Drive Output. Connect to the gate of the external n-channel MOSFET. 77 VOUT Output Voltage Sense. VOUT is the negative rail of the load. Connect to the drain of the external n-channel MOSFET. 8 — PGOOD Power-Good, Active-Low, Open-Drain Output. Referenced to VOUT. PGOOD asserts low when VOUT is within the limits and there is no fault. — 8 PGOOD Power-Good, Active-High, Open-Drain Output. Referenced to VOUT. PGOOD asserts high when VOUT is within limits and there is no fault. Pin Description |
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